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Introduction <p>This study aimed to evaluate the effect of low-temperature intracanal sodium hypochlorite (NaOCl) irrigation on root surface temperature reduction and its ability to dissolve organic tissue.</p> Methods <p>Extracted mandibular premolars were accessed and instrumented. Final irrigation protocols with NaOCl, at two different temperatures: room temperature (control) and 2.5&#xa0;°C (experimental), were applied. Initial and the lowest root surface temperatures were recorded using a digital thermometer. Organic tissue dissolution was assessed using glass capillaries, filled with catgut, attached to 3D-printed maxillary incisors exposed to the same irrigation protocols. Data was statistically analyzed.</p> Results <p>Low-temperature NaOCl irrigation led to a significantly greater reduction in root surface temperature compared to room temperature NaOCl (<i>p</i> &lt; 0.05). Both irrigation protocols showed similar organic tissue dissolution, with no significant difference between them (<i>p</i> &gt; 0.05).</p> Conclusion <p>Intracanal irrigation with low-temperature NaOCl effectively reduced root surface temperature while maintaining its organic tissue dissolution capacity.</p> Clinical relevance <p>The use of cold sodium hypochlorite represents a simple and effective intracanal cryotherapy approach that may help to minimize postoperative inflammation while preserving the chemical efficacy of the irrigation during endodontic treatment.</p>

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Effect of low-temperature intracanal sodium hypochlorite on root surface temperature reduction and organic tissue dissolution: an in vitro study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月31日

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  • Marcos Felipe Iparraguirre Nuñovero,
  • Marco Antonio Hungaro Duarte,
  • Ulisses Xavier da Silva Neto,
  • Vânia Portela Ditzel Westphalen,
  • Pedro Cesar Gomes Titato,
  • Bruno Cavalini Cavenago,
  • Everdan Carneiro

摘要

Introduction

This study aimed to evaluate the effect of low-temperature intracanal sodium hypochlorite (NaOCl) irrigation on root surface temperature reduction and its ability to dissolve organic tissue.

Methods

Extracted mandibular premolars were accessed and instrumented. Final irrigation protocols with NaOCl, at two different temperatures: room temperature (control) and 2.5 °C (experimental), were applied. Initial and the lowest root surface temperatures were recorded using a digital thermometer. Organic tissue dissolution was assessed using glass capillaries, filled with catgut, attached to 3D-printed maxillary incisors exposed to the same irrigation protocols. Data was statistically analyzed.

Results

Low-temperature NaOCl irrigation led to a significantly greater reduction in root surface temperature compared to room temperature NaOCl (p < 0.05). Both irrigation protocols showed similar organic tissue dissolution, with no significant difference between them (p > 0.05).

Conclusion

Intracanal irrigation with low-temperature NaOCl effectively reduced root surface temperature while maintaining its organic tissue dissolution capacity.

Clinical relevance

The use of cold sodium hypochlorite represents a simple and effective intracanal cryotherapy approach that may help to minimize postoperative inflammation while preserving the chemical efficacy of the irrigation during endodontic treatment.